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Commite6d9e21

Browse files
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Add a \setenv command to psql.
This can be used to set (or unset) environment variables that willaffect programs called by psql (such as the PAGER), probably mostusefully in a .psqlrc file.Andrew Dunstan, reviewed by Josh Kupershmidt.
1 parenteb06416 commite6d9e21

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3 files changed

+65
-1
lines changed

3 files changed

+65
-1
lines changed

‎doc/src/sgml/ref/psql-ref.sgml‎

Lines changed: 18 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -2241,6 +2241,24 @@ lo_import 152801
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</varlistentry>
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<varlistentry>
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<term><literal>\setenv [ <replaceable class="parameter">name</replaceable> [ <replaceable class="parameter">value</replaceable> ] ]</literal></term>
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<listitem>
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<para>
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Sets the environment variable <replaceable
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class="parameter">name</replaceable> to <replaceable
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class="parameter">value</replaceable>, or if the
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<replaceable class="parameter">value</replaceable> is
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not supplied, unsets the environment variable. Example:
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<programlisting>
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testdb=&gt; <userinput>\setenv PAGER less</userinput>
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testdb=&gt; <userinput>\setenv LESS -imx4F</userinput>
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</programlisting>
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>\sf[+] <replaceable class="parameter">function_description</> </literal></term>
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‎src/bin/psql/command.c‎

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Original file line numberDiff line numberDiff line change
@@ -1110,6 +1110,51 @@ exec_command(const char *cmd,
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free(opt0);
11111111
}
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/* \setenv -- set environment command */
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elseif (strcmp(cmd,"setenv")==0)
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{
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char*envvar=psql_scan_slash_option(scan_state,
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OT_NORMAL,NULL, false);
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char*envval=psql_scan_slash_option(scan_state,
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OT_NORMAL,NULL, false);
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if (!envvar)
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{
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psql_error("\\%s: missing required argument\n",cmd);
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success= false;
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}
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elseif (strchr(envvar,'=')!=NULL)
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{
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psql_error("\\%s: environment variable name must not contain '='\n",
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cmd);
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success= false;
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}
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elseif (!envval)
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{
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/* No argument - unset the environment variable */
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unsetenv(envvar);
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success= true;
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}
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else
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{
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/* Set variable to the value of the next argument */
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intlen=strlen(envvar)+strlen(envval)+1;
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char*newval=pg_malloc(len+1);
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snprintf(newval,len+1,"%s=%s",envvar,envval);
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putenv(newval);
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success= true;
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/*
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* Do not free newval here, it will screw up the environment
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* if you do. See putenv man page for details. That means we
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* leak a bit of memory here, but not enough to worry about.
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*/
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}
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free(envvar);
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free(envval);
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}
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/* \sf -- show a function's source code */
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elseif (strcmp(cmd,"sf")==0||strcmp(cmd,"sf+")==0)
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{

‎src/bin/psql/help.c‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -158,7 +158,7 @@ slashUsage(unsigned short int pager)
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{
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FILE*output;
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161-
output=PageOutput(93,pager);
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output=PageOutput(94,pager);
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/* if you add/remove a line here, change the row count above */
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@@ -257,6 +257,7 @@ slashUsage(unsigned short int pager)
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fprintf(output,_("Operating System\n"));
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fprintf(output,_(" \\cd [DIR] change the current working directory\n"));
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fprintf(output,_(" \\setenv NAME [VALUE] set or unset environment variable\n"));
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fprintf(output,_(" \\timing [on|off] toggle timing of commands (currently %s)\n"),
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ON(pset.timing));
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fprintf(output,_(" \\! [COMMAND] execute command in shell or start interactive shell\n"));

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